Unit 4 第1课时 Section A 1a—1d-【七彩课堂】2025-2026学年八年级英语下册同步课件（人教版）

Section A 1a—1d Unit 4 The Wonders of Nature Objectives To talk about geography facts about natural wonders. To compare facts about famous places. To share geography facts using large numbers. 2 Lead-in What do you know about MountQomolangma? What makes it amazing? It’s the highest mountain in the world. ... It’s 8848.86 metres high. What do you know about the Sahara Desert? What makes it amazing? It’s about 9,000,000 square kilometres in size. It’s the biggest desert in the world. ... What do you know about the Dead Sea? What makes it amazing? Its surface is 416 metres below sea level. It’s the lowest place in the world. ... What do you know about the Mariana Trench? What makes it amazing? It’s about 11,000 metres deep. It’s the deepest point in the ocean. ... Match the places with the pictures. 1a _____ Nile River _____ Angel Falls _____Mount Qomolangma _____ Dead Sea _____ Sahara Desert _____ Mariana Trench F A D C E B Listen to the game show. Complete the descriptions of the places. 1b Place Description Measurement Mount Qomolangma the ________________ in the world _________ metres high Sahara Desert the _______________ in the world about _________ square kilometres in size Dead Sea the _______________ on earth ________ metres below sea level Meriana Trench the _______________ in the ocean about ________ metres deep highest mountain 8848.86 lowest place 9,000,000 biggest desert 416 deepest point 11,000 最高级 (superlatives) “highest” is the superlative of “high” “biggest” is the superlative of “big” “lowest” is the superlative of “low” “deepest” is the superlative of “deep” 形容词 / 副词最高级变化规则 high— highest low — lowest deep —deepest 一般情况下，在词尾加-est large — largest fine — finest 以不发音字母e结尾的词，在词尾加-st heavy — heaviest easy — easiest early — earliest 以“辅音字母 + y”结尾的双音节词，先把y改为 i ,再加-est 形容词 / 副词最高级变化规则 big — biggest fat — fattest thin — thinnest 重读闭音节词词尾只有一个辅音字母时，先双写该辅音字母，再加-est beautiful — most beautiful interesting — most interesting delicious — most delicious 多音节词和部分双音节词在词前加most 不规则变化 原级 最高级 good / well best bad / badly worst many / much most little least far farthest furthest GOOD, BETTER, BEST Good, better, best, Never let it rest, Till good be better, And better best. Bad, worse, worst, Never fight against, Get better and better, And you’ll be the best. big bigger biggest This apple is the biggest of the three. 10 yuan 20 yuan 50 yuan This pen is the most expensive of the three. expensive more expensive 1c Listen again. Complete the measurements in 1b with the numbers below. Listening tips: 1. Learn about the listening tasks and look through the numbers in the box. 2. Pay attention to the places and numbers while listening. 3. Match the places with the numbers. 416 8848.86 11,000 9,000,000 较大数字的表达方法 1000以上的基数词的表示法：从数字的右端向左端数，每三位数加一个逗点；从右端向左端开始，第一个逗点处读thousand(千)，第二个逗点处读million(百万)，第三个逗点读billion(十亿)；读的时候通常在hundred后加and,如果百位数为0，则在thousand后加and。 较大数字的表达方法 9,883 65,359 265,468 60,263,050 nine thousand, eight hundred and eighty-three sixty-five thousand, three hundred and fifty-nine two hundred and sixty-five thousand, four hundred and sixty-eight sixty million, two hundred and sixty-three thousand and fifty 1d Talk about the places you have learnt about. What’s the lowest place on earth? It’s the deep sea. Its surface is 416 metres below sea level. Now, what’s … How low is it? Ask and answer. What’s the highest mountain in the world? It’s Mount Qomolangma! How high is it? It’s 8848.86 metres high. What’s the biggest desert in the world? It’s the Sahara Desert! How big is it? It’s about 9,000,000 square kilometres. Where’s the deepest point in the ocean? It’s the Mariana Trench! How deep is it? It’s about 11,000 metres deep. Language points 1. _____ metres below sea level 海平面下_____米 below prep. 在（或到）……下面；少于；低于 adv. 在（或到）……下面 （1）Please don’t write below this line. 请不要写到这条线下面。 （2）They live on the floor below. 他们住在下一层楼。 prep. adv. 拓展 The mouse is under the desk. 老鼠在桌子下面。 在（或到、通过）……下面（表示在某物的正下方） 高度；水平 22 2. Its surface is … metres below sea level. 它的平面在海平面以下……米。 surface n. 表面；表层 v. 浮出水面；显露；出现 （1）The surface of the desk is smooth. 桌子的表面很光滑。 （2）The submarine surfaced near the island. 潜艇在岛屿附近浮出水面。 n. v. 写出下列单词的最高级。 1. good _______ 2. comfortable ________________ 3. big _______ 4. happy ________ 5. cheap ________ 6. many _______ 7. difficult ______________ 8. little _____________ best most comfortable biggest happiest cheapest most most difficult least Exercises 写出下列数字的英文表达。 433,024 856,730,452 59,725 four hundred and thirty-three thousand and twenty-four eight hundred and fifty-six million, seven hundred and thirty, four hundred and fifty-two fifty-nine thousand, seven hundred and twenty-five Homework 1.Read the conversations. 2.Make a conversation with your partner about the wonders of nature you know well and write it down. 伴你成长 感谢您的观看 null 106556.055 $Welcome to our game show. Today is all about geography. Answer as quickly as you can. Question one, what is the highest mountain in in the world? It's might come . allama correct. How high is IT? I know this is . eight thousand eight hundred and forty eight point four three meters high. No, sorry. Fishing is IT eight thousand . eight hundred and forty eight point eight six meters. yes. But some scientists say, come a longer, is still growing taller. Now, name the biggest desert in the world. the tecla and desert. Wrong, ella, it's the . sahara desert . right now. How big is IT? It's about nine thousand, zero zero zero square kilometers. That's right. What's the lowest place on earth? It's the dead sea. Well done. Its surfaces four hundred sixteen meters below sea level. Now where's the deepest point in the ocean? It's in the mariana trench. That's correct. How deep is IT? It's about eleven thousand . and meters deep, correct?